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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db75378537812ac7b669c2baf39c9a0b634d8acdfeb68a8f79dd6ce4aef6f3c2' 
  AND token = 'fvpzp0VKgBGqchGHd9yMTz5KCRWK7o64RERdZBeFHO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}